Thomy, the Swiss, is absolutely the best.
In Israel, Heinz is great (made in Spain, I think). Second choice is Shufersal’s home brand (made in Germany), also excellent – actually they share the 1st place.
After that, at a VERY, VERY large distance, is Hellmans followed by the Israeli mayonaises (Talma-Shefa and the like) which are plain disgusting, the smell reminds of of anesthesia gas when I was a child and had surgery and got anesthesia by mask.